WO2019152739A1 - Fibre optique à large bande passante à faible perte - Google Patents

Fibre optique à large bande passante à faible perte Download PDF

Info

Publication number
WO2019152739A1
WO2019152739A1 PCT/US2019/016185 US2019016185W WO2019152739A1 WO 2019152739 A1 WO2019152739 A1 WO 2019152739A1 US 2019016185 W US2019016185 W US 2019016185W WO 2019152739 A1 WO2019152739 A1 WO 2019152739A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber
core
refractive index
cladding region
microns
Prior art date
Application number
PCT/US2019/016185
Other languages
English (en)
Inventor
Dana Craig Bookbinder
Ming-Jun Li
Pushkar Tandon
Original Assignee
Corning Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Corning Incorporated filed Critical Corning Incorporated
Publication of WO2019152739A1 publication Critical patent/WO2019152739A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
    • G02B6/03627—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - +
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02266—Positive dispersion fibres at 1550 nm

Definitions

  • the disclosure generally relates to low attenuation optical fibers suitable for dense wavelength division multiplexing (DWDM).
  • DWDM dense wavelength division multiplexing
  • Optical fibers for long haul DWDM applications are currently operated in the C band (1530 nm to 1565 nm) and L band (1565 nm to 1625 nm).
  • the standard single mode transmission optical fiber utilized in these applications has a cable cutoff wavelength below 1260 nm and is optimized for transmission in both the 1310 nm and the 1550 nm wavelength windows.
  • These fibers are also used in L band applications, although they suffer from relatively high bend losses in the 1625 nm wavelength range.
  • the bending performance of these fibers is further compromised due to very large macro and micro bend induced losses.
  • typical optical transmission fibers designed to operate within C and L bands have not been utilized in the 1625 nm to 1675 nm wavelength range because they suffer from very high bend induced losses within this wavelength range.
  • optical fiber designs that can operate at longer wavelengths (beyond L band) with low bending loss, in order to further increase the bandwidth capacity of the fiber and to provide more usable signal channels.
  • the fiber embodiments described herein can advantageously operate with low bend losses at 1625 nm to 1675 nm wavelengths, and/or even at a longer wavelength range (1675 nm to 1725 nm), to provide additional DMDW channels.
  • a single mode optical fiber comprises:
  • a silica based core comprising a refractive index profile with an alpha (a) between 1.8 and 200, a relative refractive index D i m, , lx % with respect to silica, and an outer radius n, wherein 7 microns > n> 4.5 microns, the core further comprising silica doped with chlorine, wherein the maximum chlorine concentration in the core is greater than 0.5 wt%; and
  • a cladding comprising an outer cladding region surrounding the core, the outer cladding region having a relative refractive index D 4 % with respect to silica, and
  • the core is structured such that
  • V m is the moat volume (for optical fibers without a moat region in the cladding
  • V m 0
  • V c a function of core alpha (a) such that
  • V c -0.0383a 3 + 0.4624a 2 - 1.924a + 5.9152 , for 1 ⁇ a ⁇ 5;
  • V c 2.123 - 0.0474a for 5 ⁇ a ⁇ l0
  • V c 2.771 - 0.0l22a, for l0 ⁇ a ⁇ 20,
  • V c 2.5575 - 0.00l 5a, for 20 ⁇ a ⁇ l00,
  • V c 2.5575 - 0.0005a , for 100 ⁇ a;
  • said fiber having mode field diameter (MFD) at 1550 nm wavelength of 10 to 12 microns, a zero dispersion wavelength of less than 1400 nm, a 22 m cable cutoff wavelength of greater than l275nm and less than 1530 nm; and
  • MFD mode field diameter
  • the maximum chlorine concentration in the core is greater than 1 wt%, for example greater than 1.5 wt%, greater than 2 wt %, or greater than 3wt%. According to some embodiments the maximum chlorine concentration in the core is between 0.5 wt% and 5 wt%. According to some embodiments the maximum chlorine concentration in the core is between 0.5 wt% and 5 wt% and the cladding comprises silica doped with fluorine. According to some embodiments the maximum chlorine concentration in the core is between 0.5 wt% and 5 wt% and the maximum concentration of GeCh in the core is less than 0.1 wt%.
  • the maximum chlorine concentration in the core is between 0.5 wt% and 5 wt%.
  • the core is germania free.
  • the core is alkali free.
  • the optical fiber is germania free.
  • the zero dispersion wavelength is less than 1350 nm, and in some embodiments it is less than 1340 nm. According to some embodiments the zero dispersion wavelength is less than 1330 nm. According to some embodiments the zero dispersion wavelength is between 1280 nm and 1350 nm. According to some embodiments the zero dispersion wavelength is between 1280 nm and 1340 nm. According to some embodiments the zero dispersion wavelength is between 1280 nm and 1330 nm. According to some embodiments the zero dispersion wavelength is between 1285 nm and 1325 nm.
  • the 22 m cable cut off wavelength is between 1380 nm and 1540 nm. According to some embodiments the 22 m cable cut off wavelength is between 1390 nm and 1530 nm.
  • the cladding comprises a moat surrounding the core, the moat having a relative refractive index
  • the moat has an outer radius n, and 4.5 microns ⁇ r 3 ⁇ 25 microns ln some embodiments 5 microns ⁇ r 3 ⁇ 23 microns ln some embodiments 5 microns ⁇ r 3 ⁇ 20 microns.
  • the cladding comprises a first cladding region and an outer cladding region, the outer cladding region surrounds the first cladding region, the first cladding region is in contact with and surrounds the core, the first cladding region has a relative refractive index D 2 % , an inner radius n, and an outer radius r 2 , wherein r 2 ⁇ 20 microns and D 2 % ⁇ D ⁇ hiac %; the cladding further comprises a moat surrounding the first cladding region and situated between the first cladding region and the outer cladding region, the moat having a relative refractive index A 2 m in%, an inner radius r 2, and an outer radius r 3 , wherein r 3 ⁇ 25 microns ln some embodiments r 2 ⁇ 15 microns ln some embodiments r 2 ⁇ 11 microns ln some embodiments 4.5 microns ⁇ r 2 ⁇ 11 microns.
  • microns ⁇ r 3 9 microns ⁇ r 3 ⁇ 25 microns ln some embodiments, 11 microns ⁇ n£25 microns ln some embodiments, 10 microns ⁇ n£25 microns ln some embodiments, 10 microns ⁇ r 3 ⁇ 23 microns ln some embodiments, 9 microns ⁇ r 3 ⁇ 20 microns ln some embodiments 10 microns ⁇ r 3 ⁇ 20 microns ln some embodiments, 11 microns ⁇ r 3 ⁇ 20 microns.
  • the bend loss is less than 0.001 dB/tum at 1550 nm wavelength, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.0005 dB/tum at 1550 nm wavelength, when the fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.2 dB/tum at 1700 nm wavelength, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.1 dB/tum at 1700 nm wavelength, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0. ldB/tum at 1650 nm wavelength, when the fiber is bent around a 20 mm diameter mandrel, and according to some embodiments not greater than 0.003 dB/tum at 1650 nm wavelength, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.1 dB/tum at 1700 nm wavelength, when the fiber is bent around a 20 mm diameter mandrel, and not greater than 0.005 dB/tum at 1700 nm wavelength, when the fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.1 dB/tum at 1700 nm wavelength, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.0005 dB/tum at 1700 nm wavelength, when the fiber is bent around a 30 mm diameter mandrel. [0021] According to some embodiments 10.7 microns > MFD (at 1550 nm) > 9.2 microns. According to some embodiments 10.6 microns > MFD (at 1550 nm) > 9.2 microns.
  • the fiber cladding includes a moat, and 0.1% > D 4 % - A 3 min% > 0.45%.
  • the fiber cladding includes a first cladding region with a relative refractive index D 2 %, and the outer cladding region that surrounds, and is in direct contact with, the first cladding region ln at least some of these embodiments D i , mx % - D 2 % > 0.3%, and 0% ⁇ D i max % ⁇ 0.5%. ln some of these embodiments Ai max % - D 2 % > 0.35%, and 0% ⁇ Ai max % ⁇ 0.5%.
  • the fiber cladding includes a first cladding region, a moat surrounding the first cladding region, and an outer cladding region that surrounds the moat. According to some of these embodiments 0.1 % ⁇ (D4% - D3ih ⁇ h%) ⁇ 0.45% and 0.3 % ⁇ (D2% - D3h ⁇ h%) ⁇ 0.45%.
  • F1G. 1 is a schematic diagram that depicts relative refractive index as a function of fiber radius for one exemplary optical fiber embodiment described herein.
  • F1G. 2 is a schematic diagram that depicts relative refractive index as a function of fiber radius for another exemplary optical fiber embodiments described herein;
  • F1G. 3 is a schematic diagram that depicts relative refractive index as a function of fiber radius for another exemplary optical fiber embodiments described herein;
  • F1G. 4 is a schematic diagram that depicts relative refractive index as a function of fiber radius for yet another exemplary optical fiber embodiments described herein.
  • the term“and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
  • The“refractive index profile” is the relationship between refractive index or relative refractive index and fiber radius.
  • The“relative refractive index percent” (also referred to as the relative refractive index herein) is defined in Equation (1) below as:
  • D% 100C(H; 2 -H., 2 )/2H; 2 (1) where n s is the refractive index of pure silica and n, is the average refractive index at point / in the particular region of the optical fiber.
  • the relative refractive index is represented by D% and its values are given in units of“%”, unless otherwise specified.
  • the terms %D, D%, percent delta index, % delta and % can be used interchangeably herein ln cases where the refractive index of a region is less than the refractive index of undoped silica, the relative refractive index percent is negative and is referred to as having a depressed region or depressed index relative to silica ln cases where the refractive index is greater than the refractive index of undoped silica, the relative index percent is positive.
  • An“up-dopant” is herein considered to be a dopant which has a propensity to raise the refractive index relative to pure undoped silica.
  • A“down-dopant” is herein considered to be a dopant which has a propensity to lower the refractive index relative to pure undoped silica.
  • Examples of up-dopants include GeCfr, AI 2 O 3 , P 2 O 5 , T1O 2 , Cl, and Br.
  • Examples of down-dopants include F and B.
  • Zero dispersion wavelength is a wavelength at which the dispersion has a value of zero.
  • Dispersion slope is the rate of change of dispersion with respect to wavelength.
  • Equation (2) ‘Effective area” is defined in Equation (2) as follows:
  • “effective area” or“A :/ /” refers to optical effective area at a wavelength of 1550 nm (i.e., the fundamental mode) unless otherwise noted.
  • the term“alpha” or“a-profile” refers to a relative refractive index profile of the core, which is expressed in terms of D I (G) %.
  • the core alpha a defines how the relative refractive index profile of the core changes with respect to the radius r.
  • D I (G) % is in units of “%,” where r is radius, and the relationship between the relative refractive index profile of the core and radius r is described by Equation (3) as follows:
  • D i m ax% is the peak (i.e., maximum) relative refractive index percent of the fiber core (relative to pure silica)
  • D i m in% is the minimum relative refractive index percent of the fiber core (relative to pure silica)
  • n is the core radius.
  • Alpha as reported herein is measured at 1550 nm.
  • an a of 1.5 ⁇ a ⁇ 5 corresponds to a strongly graded index profile
  • a > 10 corresponds to a profile approaching a step index (i.e., a“step like index profile” as used herein) profile.
  • the mode field diameter (MFD) is measured using the Peterman 11 method as understood in the field of this disclosure according to Equation (4) as follows:
  • V m is the moat volume (i.e., the relative refractive index volume of the moat).
  • the parameter X depends on the size and the shape of the fiber core and is defined as:
  • m is the maximum refractive index of the fiber core
  • ri is an outer radius of the fiber core
  • a cmax is related to the maximum relative refractive index of the fiber core and is defined as D cmax (Di max% -D 4 %)/100%,
  • D 4 % is relative refractive index percent of the fiber’s outer cladding region
  • V c is a function of core alpha (i.e., it is a function of a), as described below.
  • Calculation of Ac ma x is illustrated using the following example: ln example 17 (EX. 17) of optical fiber embodiment provided below in in Table 1B, the maximum or the peak relative refractive index percent of the fiber core D i max is 0.43%, and D 4 % is 0.05%.
  • the parameter A cmax is measured as a ratio, and not in %.
  • Vc is calculated as follows:
  • V c -0.0383a 3 + 0.4624a 2 - l.924a + 5.9152 for 1 ⁇ a ⁇ 5
  • V c 2.123 - 0.0474a for 5 ⁇ a ⁇ 10
  • V c 2.771 - 0.0l22a for 10 ⁇ a ⁇ 20
  • V c 2.5575 - 0.0015a for 20 ⁇ a ⁇ l00
  • V c 2.5575 - 0.0005a for a ⁇ 200.
  • V c numbers for several exemplary alpha values:
  • A“cable cutoff measurement,” as used herein, is performed using the standard 22 m test described in E1A-455-170 Cable Cutoff Wavelength of Single -mode Fiber by
  • the fibers of this disclosure have an outer cladding diameter of between about 80 microns and about 150 microns ln some aspects, the optical fibers may have an outer cladding diameter of between about 120 microns and about 130 microns. Certain preferred embodiments of the fibers have an outer cladding diameter of about 125 microns.
  • the embodiments of the optical fibers 100 described herein have cores that can have a step index or a graded index profile.
  • the fiber cores of the exemplary embodiments described herein have a refractive index profile with an alpha of 200 or less, for example between 1.8 and 200, or between 1.9 and 100, or between 1.9 and 20.
  • the core alpha of the exemplary graded index core fibers 100 may be 1.95, or 2, or 2.1, or 2.2, or 2.3, or 2.5, or 3, or 4, or 5 or therebetween.
  • a graded refractive index core with an alpha less than 5 helps in reducing the small angle scattering contribution to the optical fiber attenuation.
  • the exemplary optical fiber embodiments have attenuation levels at 1550 nm of less than about 0.18 dB/km, for example, less than about 0.175 dB/km, less than 0.17 dB/km, or even less than 0.16 dB/km. According to some embodiments the optical fiber may have attenuation from about 0.16 dB/km to 0.18 dB/km at a 1550 nm wavelength.
  • FIGs. 1-4 depict schematically relative refractive index profiles as a function of fiber radius for several exemplary embodiments of the optical fibers 100, according to aspects of this disclosure. These relative refractive index profiles (in terms of D%) of the exemplary embodiments of the optical fibers 100 are specified and/or plotted relative to pure (undoped) silica (which has the relative refractive index of 0%). These exemplary embodiments of optical fiber 100 are single mode (SM) at 1550 nm.
  • SM single mode
  • optical fiber 100 possesses a core 101.
  • the relative refractive index Di% of the core 101 may vary as a function of fiber radius (r), and has a maximum relative refractive index D i , mx % ⁇
  • the core 101 has an outer core radius n which corresponds to minimum relative refractive index D i m in%.
  • the core 101 from its center to its radius n contains S1O2 doped with Cl. ln some embodiments additional dopants (e.g., F) may also be utilized. Optionally, the core 101 may be additionally doped with K2O, and/or P2O5. These dopants may be introduced into the S1O2 core 101 by OVD, VAD, MCVD, and PCVD processing methods.
  • the cores 101 of the fibers 100 disclosed herein may optionally contain some level of alkali
  • the exemplary embodiments disclosed herein may employ cores which are substantially free of alkali ln at least some embodiments the cores have essentially no alkali ln at least some embodiments the cores contain no alkali.
  • the core 101 of the optical fibers 100 may have a peak relative refractive index delta Di , mx % of about 0% to about +0. 55%, (e.g., 0.3% to 0.5 %) relative to pure silica-r The difference between peak (maximum) relative refractive index delta of the core,
  • Di max % and the relative refractive index delta of the outer cladding region may range from about from about 0.3% to 0.5%, or from 0.25% to 0.45%.
  • the core 101 of exemplary embodiments of the optical fibers 100 is preferably configured for single mode operation at 1550 nm, and in such embodiments may have a core radius n of about 4.5. to 7.5 microns.
  • the effective area, A eff , of core 101 at 1550 nm may range from about 70 pm 2 to about 90 pm 2 (for example, between 72 pm 2 and 87 pm 2 ).
  • the effective area, A eff , of core 101 at 1650 nm may range from about 75 pm 2 to about 100 pm 2 (for example, between 78 pm 2 and 96 pm 2 ) ln some embodiments the effective area, A eff , of the core 101 at 1700 nm may range from about 75 pm 2 to about 100 pm 2 (for example, between 80 pm 2 and 97 pm 2 ).
  • Optical fibers 100 have a cladding 141 that includes one or more cladding regions. Cladding 141 has a thickness 200. Optical fibers 100 may also include a protective coating 151 (not shown) situated over the cladding 141.
  • the cladding regions comprise silica, and one or more cladding regions may be down-doped or up-doped relative to silica ln addition, as discussed below, the cladding 141 may include a depressed index region (also referred to herein as a“moat”, or a“moat region”) having a relative refractive index that is substantially constant and lower than a relative refractive index of the of the outer cladding region (with the outer cladding region having the relative refractive index profile A4% depicted in F1G. 1).
  • a“moat”, or a“moat region having a relative refractive index that is substantially constant and lower than a relative refractive index of the of the outer cladding region (with the outer cladding region having the relative refractive index profile A4% depicted in F1G. 1).
  • the cladding regions may primarily contain S1O2 doped with F, with an outer cladding region having a smaller amount of F than the depressed index region.
  • Cl and/or GeC can be employed as dopants in the various cladding regions in addition to the F dopant.
  • the outer cladding region may be primarily contain S1O2 (i.e., it can be without F).
  • the cladding 141 comprises a depressed refractive index region 120 and the outer cladding region 130 surrounds the moat 120.
  • the depressed refractive index region (moat) 120 is a cladding region that has a lower refractive index than the directly adjacent fiber regions. This is shown, for example, in Figs. 1, 2, 3.
  • the depressed index cladding region (moat) has a relative refractive index D ⁇ resume 1 ih % and an outer radius G3.
  • the cladding 141 comprises a first cladding region 110 in contact with and surrounding the core 101 , a depressed index cladding region (moat) 120 surrounding the core 101 and situated in contact with the first cladding region 110, and an outer cladding region 130 surrounding both the first cladding region 110 and the depressed index cladding region (moat) 120.
  • the first cladding region 1 10 has an inner radius n and an outer radius T2.
  • the moat 120 has an inner radius 2 and an outer radius G3.
  • the outer cladding region 130 has an inner radius G3 and an outer radius r 4 .
  • the relative refractive index (corresponding to D 4 %) of the outer cladding 130 is preferably substantially constant out to the outer radius r 4 .
  • Each of these cladding regions 1 10, 120, 130 surrounds the core 101. Together, these cladding regions possess a total thickness 200, corresponding to the thickness of the cladding 141.
  • the total thickness 200 of the cladding 141 is r 4 -ri.
  • the depressed index cladding region (moat) 120 has a relative refractive index with a lower refractive index delta than the relative refractive index profile of the outer cladding region 120.
  • the relative refractive index percent (A3mm%) of the depressed index cladding region 120 is lower than the relative refractive index (D 2 %) of the first cladding region 1 10 and is also lower than the relative refractive index (D 4 %) of the adjacent outer cladding region 130.
  • lt is noted that Br, and/or F and/or Cl, or combinations thereof, may be included as refractive index altering dopants in the depressed index cladding region 120 to facilitate the creation of the moat of width mi with respect to outer cladding region 130.
  • the relative refractive index profile of the outer cladding 130 is preferably substantially constant out to its outer radius r 4.
  • optical fibers 100 and described herein are configured for single mode operation at a wavelength greater than 1530 nm (e.g., 1550 nm 1600 nm, 1650 nm and/or 1700 nm) and can advantageously have excellent performance and
  • optical fibers 100 and described herein are also advantageously configured for single mode operation within the 1625 nm 1725 nm wavelength band.
  • the optical fibers 100 maybe used to transmit optical signals in both the C and L bands, as well as in the 1625 nm to 1675 nm band with low bend losses.
  • optical fibers 100 can be operated simultaneously as C-band fibers (for transmission in 1530 to 1565 nm wavelength band), as L band fibers (for transmission in 1565 to 1625 nm wavelength band) and in the additional 100 nm wide wavelength range (1625 nm to 1725 nm), while simultaneously operating with low bend losses across in each of these wavelength bands (C, L, and the 1625 nm to 1725 nm wavelength bands).
  • “bend loss” refers to a macrobend loss value for the optical fibers, as measured at the specified wavelength, in units of dB/tum. Exemplary values for the bend losses for different exemplary fiber 100 embodiments are provided in Tables 1A and IB at different wavelengths.
  • the bend loss is less than O.ldB/tum at 1550 nm wavelength when the fiber is bent around a 20 mm diameter mandrel; and less than 0.001 dB/tum at 1550 nm wavelength when the optical fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.05 dB/tum at 1550 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than
  • the bend loss between 10 4 dB/turn and 0.05 dB/turn at 1550 nm, when the fiber is bent around a 20 mm diameter mandrel, and between 10 4 dB/tum and O.OOldB/tum at 1550 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.07 dB/tum at 1550 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than 0.0007 dB/tum at 1550 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.05 dB/tum at 1550 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than 0.0005 dB/tum at 1550 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.07 dB/tum at 1600 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than O.OOldB/tum at 1600 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.05 dB/tum at 1600 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than O.OOldB/tum at 1600 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss between 10 4 dB/tum and 0.05 dB/tum at 1600 nm, when the fiber is bent around a 20 mm diameter mandrel, and between 10 4 dB/tum and O.OOldB/tum at 1600 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.005dB/tum at 1600 nm wavelength when the fiber is bent around a 20 mm diameter mandrel; and less than 0.001 dB/tum at 1600 nm wavelength when the optical fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.007 dB/tum at 1600 nm, when the fiber is bent around a 20 mm diameter mandrel, and not greater than 0.0007 dB/tum, when the fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.05 dB/tum at 1600 nm, when the fiber is bent around a 20 mm diameter mandrel. According to some embodiments the bend loss is not greater than 0.0005 dB/tum at 1600 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.1 dB/tum at 1650 nm, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.001 dB/tum, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss between 10 4 dB/tum and 0.1 dB/tum at 1650 nm, when the fiber is bent around a 20 mm diameter mandrel, and between 10 4 dB/tum and O.OOldB/tum at 1650 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.08 dB/tum at 1650 nm, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.0008 dB/tum, when the fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.05 dB/tum at 1650 nm, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.001 dB/tum, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.5dB/tum at 1700 nm wavelength when the fiber is bent around a 20 mm diameter mandrel; and not greater than 0.006 dB/tum at l700nm wavelength when the optical fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.25dB/tum at 1700 nm wavelength when the fiber is bent around a 20 mm diameter mandrel; and not greater than 0.006 dB/tum at l700nm wavelength when the optical fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is between 10 4 dB/tum and 0.5 dB/tum at 1700 nm, when the fiber is bent around a 20 mm diameter mandrel, and between 10 4 dB/tum and 0.005dB/tum at 1700 nm, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is not greater than 0.225 dB/tum at 1700 nm when the fiber is bent around a 20 mm diameter mandrel, and not greater than 0.005dB/tum, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.2 dB/tum at 1700 nm, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.004dB/tum, when the fiber is bent around a 30 mm diameter mandrel. According to some embodiments the bend loss is less than 0.15 dB/tum at 1700 nm, when the fiber is bent around a 20 mm diameter mandrel and not greater than 0.004dB/tum, when the fiber is bent around a 30 mm diameter mandrel.
  • the bend loss is less than 0.1 dB/tum at 1700 nm, when the fiber is bent around a 20 mm diameter mandrel and is not greater than 0.003dB/turn, when the fiber is bent around a 30 mm diameter mandrel.
  • Tables 1A and IB Examples of modeled properties are shown below in Tables 1A and IB, consistent with one or more of the optical fibers 100 described in the foregoing aspects of the disclosure. More specifically, set forth in Tables 1A and IB below are the following parameters and fiber dimensions for five embodiments of exemplary single mode fibers:
  • the moat volume V m of the exemplary embodiments disclosed in Table 1A and 1B are between 5% D micron 2 and 60 % D micron 2 , and in at least some embodiments between 5% D micron 2 and 50% D micron 2 . Larger values of V m are obtained when the moat-contains more down dopants, e.g., fluorine or boron.
  • ln fibers of examples 7-9 (Ex. 7-Ex. 9 of Table 1A) the core 101 is in contact with and is surrounded by the depressed index cladding region 120, which is surrounded by the outer cladding region 130.
  • Fiber embodiments of examples 10-11 include a core 101 and the depressed index cladding region (moat) 120 that surrounds and is in contact with the core 101.
  • the outer cladding region 130 surrounds and is in contact with depressed index cladding region 120.
  • the relative refractive index of the moat 120 is also smaller than that of the outer cladding region -i.e., D 1 ⁇ 4 , ⁇ h % ⁇ D 4 %.
  • Fiber embodiments of examples 12 and 13 are similar to fiber embodiments of examples 10-11 , However in these exemplary embodiments the moat region 120 is down-doped with fluorine and therefore D 1 ⁇ 4 , ⁇ h % ⁇ 0%.
  • ln fiber example 13 the outer cladding is silica down doped with fluorine, thus D 4 % ⁇ 0%.
  • the outer cladding region 130 contains less fluorine than the depressed index cladding region 120, thus in this fiber embodiment A’, mm % is still less (more negative) than D 4 %.
  • the core 101 is a silica based core co-doped with Cl and F.
  • the maximum relative refractive index of the core (Ai max %) is zero because the core 101 contains both the updopant (Cl) and the downdopant (F) in the amounts that cancel each other’s effect on the refractive index of the core glass ln
  • the outer cladding region 130 contains less fluorine than the depressed index cladding region 120, thus in this fiber embodiment A >mm% is ⁇ AA%.
  • the core 101 is a silica based core doped with Cl and F.
  • the maximum relative refractive index of the core (A imax ) is zero because the core 101 contains both the updopant (cl) and the downdopant (F) in the amounts that cancel each other’s effect on the refractive index of the core glass ln
  • the depressed index cladding region 120 is in turn surrounded by an outer cladding region.
  • the depressed index cladding region 120 of this embodiment has a relative refractive index A 3mm that is smaller than that of the first cladding region 1 10 and that of the outer cladding region- i.e., A 3min % ⁇ D 2 %, and A 3min % ⁇ D4%.
  • each of the cladding regions 1 10, 120 and 130 comprise fluorine doped silica, and thus D 2 %, D4%, and D 3 , T iih% are all negative, but the depressed index cladding region 120 contains more fluorine than the cladding regions 1 10 and 130 and therefore A min ⁇ A %, and A3min ⁇ D 4 %).
  • the exemplary fiber embodiments depicted in Tables 1A and 1B have excellent optical performances and an unusually low bend loss.
  • the relative refractive index profiles shown in FlGs. 1-4, and disclosed in Tables 1 A, 1B are provided relative to pure silica.
  • the optical properties of the single-moded (SM) optical fibers in Tables 1 A and 1B exhibit excellent bend performance.
  • the optical properties of the single mode fibers described herein demonstrate low attenuation, and an excellent bend performance.
  • the alpha profile in the graded index core can be achieved using various methods such as soot to glass outside vapor deposition (OVD) and vapor-phase axial deposition (VAD) methods.
  • OLED soot to glass outside vapor deposition
  • VAD vapor-phase axial deposition
  • MCVD modified chemical vapor deposition
  • PCVD plasma-assisted chemical vapor deposition
  • the graded index refractive index profile is achieved by doping the core with either germania or chlorine precursor (e.g., SOCfr, SiCU) during the preform consolidation and/or doping step of the optical fiber preform manufacturing.
  • germania or chlorine precursor e.g., SOCfr, SiCU
  • a silica soot core preform is made, for example, using the OVD or VAD silica soot deposition process.
  • the soot preform for making optical fiber can be manufactured also by other methods.
  • high soot surface area preforms i.e., as compared to preform surface areas used in conventional optical fiber processing
  • the surface area of the soot preform is larger than 10 m 2 /gm, larger than 20 m 2 /gm, larger than 25 m 2 /gm, or even larger than 50 m 2 /gm.
  • the surface area of the soot preform can be larger than 90 m 2 /gm.
  • the embodiments described herein the soot is silica soot.
  • the surface area of the soot preform can be measured using Brunauer-Emmett- Teller (BET) surface area characterization techniques, as understood within the operative field of the disclosure.
  • BET Brunauer-Emmett- Teller
  • the soot preform has a density of about 0.5 g/cm 3 (e.g. 0.4 -0.6 g/cm 3 ) and it is prepared in a lathe by flame depositing silica soot onto a 10 mm diameter removable alumina rotating bait rod comprising a silica handle.
  • a silica soot preform is treated with a dehydration agent (for example, chlorine, SOC1 2 , SiCU, or CO) to remove the water and metal impurities.
  • a dehydration agent for example, chlorine, SOC1 2 , SiCU, or CO
  • the dehydration step is performed by exposing the preform to a temperature of between 900 °C and 1300 °C.
  • a method for making an optical fiber comprises the steps of:
  • the silica core preform is doped with chlorine during the core consolidation step to form a chlorine doped consolidated glass core preform
  • the silica soot of the inner cladding region is doped with fluorine to form a depressed index inner cladding region
  • the core and the inner cladding regions are deposited in a single step and the consolidation of the core and the inner cladding region is performed in a single step.
  • the optical fibers described herein, including fibers 100 may be fabricated with drawing processes having a draw tension of about less than 90g.
  • the draw tension is set at less than about 45g, and more preferably, set between about 30g and about 45g.
  • Fibers that are formed with these processing parameters are even less susceptible to draw- induced stresses that can be detrimental to the optical transmission properties of the fiber, including waveguide propagation performance.
  • optical fibers 100 may be drawn from optical fiber preforms made using conventional manufacturing techniques and using known fiber draw methods and apparatus, for example as are disclosed in U.S. Patent Nos. 7,565,820, 5,410,567, 7,832,675, and 6,027,062, the specifications of which are hereby incorporated by reference ln particular, optical fibers 100 can be pulled from a root portion of the optical fiber preform by a tractor within a draw furnace. After leaving the draw furnace, the bare optical fiber encounters a diameter monitor (D) which provides a signal that is used in a feedback control loop to regulate the speed of the tractor to maintain a constant fiber diameter.
  • D diameter monitor
  • the bare optical fiber then passes through a fiber tension measurement device (T) that measures the tension of the optical fiber caused by pulling the fiber from the preform.
  • T fiber tension measurement device
  • This tension can increase depending on the speed of the fiber draw, the temperature and viscosity of the root of the preform, etc.
  • One example of a fiber tension measurement device is disclosed in European Patent No. EP 0479120 A2, which is incorporated herein by reference.
  • the optical fibers disclosed herein, including fibers 100 can be drawn from such preforms and coated with standard primary and secondary urethane acrylate coatings.
  • the maximum concentration of Cl within the core is greater than 0.5 wt %. ln other embodiments, the maximum chlorine weight % in the core is greater than 1 wt %. ln still other embodiments, the maximum chlorine weight % in the core is greater than 2 wt %. ln some embodiments, the maximum germania weight % in the core is greater than 4 wt % and less than 6 wt%. According to some embodiments the concentration of Cl in the outer cladding region of the cladding is greater than 0.2 wt %. ln other embodiments, the chlorine concentration in the outer cladding is greater than 0.4 wt %.
  • the chlorine concentration in the outer cladding region of the cladding is greater than 1.2 wt %. ln yet other embodiments, the chlorine concentration in the outer cladding region is greater than 1.5 wt %. ln some embodiments, the chlorine concentration in the outer cladding region is greater than 0.2 wt % and less than 2.5 wt%. ln some other embodiments, the outer cladding is pure silica ln some other embodiments, the outer cladding is doped with fluorine ln still other embodiments, the outer cladding is doped with updopants such as germania, titania or alumina.
  • the inner cladding is pure silica ln still other embodiments, the inner cladding is doped with fluorine.
  • the concentration of fluorine in the inner cladding in these embodiments is between 0.1 wt% and 1.5 wt%.
  • the first cladding region (inner cladding) is co-doped with fluorine and chlorine.
  • the moat region has a minimum relative refractive index A ’ , mm % that is lower than that of the regions that are in contact with the moat.
  • minimum relative refractive index A ’ , mm % is smaller than that of D i max % and that of D 4 %.
  • the refractive index of the moat is less than the refractive index of the first cladding region and outer cladding region, i.e.
  • the composition of the cladding can also be important in achieving the
  • the moat region may be doped with fluorine (and/or boron) to lower the refractive index to be lower than the refractive index of the core ln
  • the low relative refractive index of a moat region can be at least 0.025% less than the maximum relative refractive index of the outer cladding region.
  • the relative refractive index difference between the moat region and the outer cladding region can be between 0.02% and 0.25%, for example between 0.04% and 0.2%.
  • the relative refractive index difference of the moat and the outer cladding (D 4 %-D3%) can be between 0.05% and 0.2%, for example between 0.12% and 0.2%.
  • a single mode optical fiber comprising:
  • a silica based core comprising a refractive index profile with an alpha (a) between 1.8 and 200, a relative refractive index Ai max % with respect to silica, and an outer radius n, wherein 7 microns >n> 4.5 microns, the core further comprising silica doped with chlorine, wherein the maximum chlorine concentration in the core is greater than 0.5 wt%; and
  • a cladding comprising an outer cladding region surrounding the core, the outer cladding region having a relative refractive index D 4 with respect to silica
  • the core is structured such that l .40 ⁇ X ⁇ 1.71
  • n maximum refractive index of the core
  • V m is moat volume
  • V c is a function of core alpha (a) such that
  • V c -0.0383a 3 + 0.4624a 2 - 1.924a + 5.9152 , for 1 ⁇ a ⁇ 5;
  • V c 2.123 - 0.0474a, for 5 ⁇ a ⁇ l 0,
  • V c 2.771 - 0.0l22a, for l0 ⁇ a ⁇ 20,
  • V c 2.5575 - 0.00l 5a, for 20 ⁇ a ⁇ l00,
  • V c 2.5575 - 0.0005a, for 100 ⁇ a; and said fiber having MFD at 1550 run wavelength of 10 to 12 microns, a zero dispersion wavelength of less than 1400 nm, a 22 m cable cutoff wavelength of greater than 1275 nm and less than 1530 nm; and
  • Clause 2 of the present disclosure extends to:-The fiber of clause 1, wherein 1.41 ⁇ X ⁇ 1 .7.
  • Clause 3 of the present disclosure extends to: The fiber of clause 1, wherein 1.45 ⁇ X ⁇ 1 .7.
  • Clause 4 of the present disclosure extends to: The fiber of clause 1, wherein the maximum chlorine concentration in the core is greater than 1 wt%.
  • Clause 5 of the present disclosure extends to: The fiber of clause 1, wherein the maximum chlorine concentration in the core is greater than 1.5 wt%
  • Clause 6 of the present disclosure extends to: The fiber of clause 1, wherein the maximum chlorine concentration in the core is greater than 2 wt%.
  • Clause 7 of the present disclosure extends to: The fiber of clause 1, wherein the maximum chlorine concentration in the core is greater than 3 wt%.
  • Clause 8 of the present disclosure extends to: The fiber of any of clauses 1-7, wherein 0% ⁇ Ai max % ⁇ 0.5%.
  • Clause 9 of the present disclosure extends to: The fiber of any of clauses 1-8, wherein 0% ⁇ Aima x % ⁇ 0.48%.
  • Clause 10 of the present disclosure extends to: The fiber of any of clauses 1 -9, further comprising a moat surrounding said core having relative refractive index A 2mm .
  • Clause 1 1 of the present disclosure extends to: The fiber of any of clauses 1-9, wherein the cladding comprises a first cladding region, the outer cladding region surrounds the first cladding region, said first cladding region being in contact with and surrounding the core, the first cladding region having a relative refractive index D 2 % , an inner radius n . and an outer radius r 2 , wherein r 2 ⁇ 20 microns, D 2 % ⁇ Di max %; said cladding further comprising a moat surrounding said core, said moat having a relative refractive index A 2mm % . an inner radius r 2, and an outer radius n, wherein n ⁇ 25 microns.
  • Clause 12 of the present disclosure extends to: The fiber of any of clauses 1- 11 , wherein the zero dispersion wavelength is less than 1330 nm.
  • Clause 13 of the present disclosure extends to: The fiber according to any of clause 1-12, wherein the bend loss is less than 0.001 dB/tum at the 1550 nm wavelength, when the optical fiber is bent around 20 mm diameter mandrel.
  • Clause 14 of the present disclosure extends to: The fiber according to any of clause 1-13, wherein the bend loss is less than 0.0005 dB/tum mandrel at the 1550 nm wavelength, when the optical fiber is bent around 30 mm diameter.
  • Clause 15 of the present disclosure extends to: The fiber according to any of clause 1-14, wherein the bend loss is less than 0.2 dB/tum at the 1700 nm wavelength, when the optical fiber is bent around 20 mm diameter mandrel.
  • Clause 16 of the present disclosure extends to: The fiber according to any of clause 1-15, wherein the bend loss is less than 0.1 dB/tum at thel700 nm wavelength, when the optical fiber is bent around 30 mm diameter mandrel.
  • Clause 17 of the present disclosure extends to: The fiber according to any of clauses 1-16, wherein 10.7 microns> MFD (at 1550 nm) >9.2 microns.
  • Clause 18 of the present disclosure extends to: The fiber according to clauses 1-16, wherein 10.6 microns> MFD (at 1550 nm) >9.7 microns.
  • Clause 19 of the present disclosure extends to: The fiber according to any of clauses 1-18, wherein 6.8 microns >n > 4.7 microns.
  • Clause 20 of the present disclosure extends to: The fiber according to any of clauses 1-18, wherein 6.7 microns >n > 4.8 microns.
  • Clause 21 of the present disclosure extends to: The fiber according to any of clauses 1-9, wherein the fiber cladding includes a moat with a relative refractive index A 3 min%, and 0.1% > D 4 % - D h ⁇ i % > 0.45%.
  • Clause 22 of the present disclosure extends to: The fiber according to any of clauses 1 -9, wherein the fiber cladding includes a first cladding region with a relative refractive index D 2 %, and the outer cladding region surrounding and in direct contact with the first cladding region and, D i max % - D 3 % is greater than 0.3%, and 0% ⁇ D i ih;k % ⁇ 0.5%.
  • Clause 23 of the present disclosure extends to: The fiber according to clause 22, wherein D i max % - D 2 % is greater than 0.35%.
  • Clause 24 of the present disclosure extends to: The fiber according to any of clauses 1-9, wherein the fiber cladding includes a first cladding region with a relative refractive index D 2 %, and a moat with a relative refractive index A 3mm surrounding the first cladding region, wherein the outer cladding region surrounds the moat, and 0.1% ⁇ (D 4 % - A 3min %) ⁇ 0.45% and 0.3 % ⁇ (D 2 %- D h ⁇ i %) ⁇ 0.45%.
  • Clause 25 of the present disclosure extends to: The fiber according to clause
  • the moat comprises moat volume V m , and 0%D micron 2 ⁇ V m ⁇ 70%D micron 2 .
  • Clause 26 of the present disclosure extends to: The fiber according to clause
  • the moat comprises moat volume V m , and 5 %D micron 2 ⁇ V m ⁇ 60%D micron 2 .
  • Clause 27 of the present disclosure extends to: The fiber according to any of clauses 1-26, wherein the core has less than 0.1 wt% germania (GeC ).
  • Clause 28 of the present disclosure extends to: The fiber according to any of clauses 1-28, wherein the core is germania free.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention concerne une fibre optique monomodale, comprenant : une fibre optique monomodale, comprenant : (i) un noyau à base de silice ayant un profil d'indice de réfraction ayant un alpha (α) entre 1,8 et 200, un indice de réfraction relatif Δ 1 max %, et un rayon externe r1, 7 microns > r1 ≥ 4,5 microns, le noyau comprenant en outre de la silice dopée avec du chlore, la concentration maximale en chlore dans le noyau étant supérieure à 0,5 % en poids ; et dans laquelle 1,40 < X < 1,7 où X = [(2π n1(2Δ 1max%r1 2)1/2/Vc) + (0,0028*Vm)], n1 est un indice de réfraction maximal du noyau, Vm est un volume de fossé, et Vc est une fonction du noyau alpha (α) et (ii) une région de gainage externe entourant la première région de gainage, la région de gainage externe ayant un indice de réfraction relatif Δ4 % de telle sorte que Δ1max > Δ4 %.
PCT/US2019/016185 2018-02-05 2019-01-31 Fibre optique à large bande passante à faible perte WO2019152739A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862626393P 2018-02-05 2018-02-05
US62/626,393 2018-02-05

Publications (1)

Publication Number Publication Date
WO2019152739A1 true WO2019152739A1 (fr) 2019-08-08

Family

ID=65494522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2019/016185 WO2019152739A1 (fr) 2018-02-05 2019-01-31 Fibre optique à large bande passante à faible perte

Country Status (2)

Country Link
US (1) US10775558B2 (fr)
WO (1) WO2019152739A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10564349B2 (en) * 2017-11-30 2020-02-18 Corning Incorporated Low bend loss optical fiber with graded index core
JP2020140080A (ja) * 2019-02-28 2020-09-03 住友電気工業株式会社 光ファイバ
NL2024130B1 (en) * 2019-10-16 2021-07-19 Corning Inc Optical fibers having core regions with reduced alpha profiles
EP3913412A3 (fr) * 2020-05-21 2022-02-23 Corning Incorporated Fibre optique à conception de double tranchée
WO2022094216A1 (fr) * 2020-10-30 2022-05-05 Corning Incorporated Fibre monomode à faible pente de dispersion
CN112230331A (zh) * 2020-11-11 2021-01-15 江苏亨通光导新材料有限公司 一种全合成低损耗单模光纤
EP4266098A1 (fr) * 2020-12-15 2023-10-25 Furukawa Electric Co., Ltd. Fibre optique, procédé de conception de fibre optique et procédé de fabrication de fibre optique
WO2022158496A1 (fr) * 2021-01-21 2022-07-28 古河電気工業株式会社 Fibre optique, ruban de fibre optique et câble à fibre optique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479120A2 (fr) 1990-10-05 1992-04-08 Corning Incorporated Procédé de surveillance de la tension d'un fibre
US5410567A (en) 1992-03-05 1995-04-25 Corning Incorporated Optical fiber draw furnace
US6027062A (en) 1997-03-25 2000-02-22 Corning Incorporated Optical fiber dual spindle winder with automatic threading and winding
US7565820B2 (en) 2002-04-30 2009-07-28 Corning Incorporated Methods and apparatus for forming heat treated optical fiber
US7832675B2 (en) 1999-12-28 2010-11-16 Corning Incorporated Method and apparatus for tensile testing and rethreading optical fiber during fiber draw
US8428411B2 (en) * 2010-03-17 2013-04-23 Draka Comteq, B.V. Single-mode optical fiber
US20170168231A1 (en) * 2014-07-10 2017-06-15 Corning Incorporated High chlorine content low attenuation optical fiber
US20180002221A1 (en) * 2015-04-15 2018-01-04 Corning Incorporated Low loss optical fibers with fluorine and chlorine codoped core regions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6917740B2 (en) 2003-05-30 2005-07-12 Corning Incorporated Optical fiber having reduced viscosity mismatch
US7536076B2 (en) * 2006-06-21 2009-05-19 Corning Incorporated Optical fiber containing alkali metal oxide
US8428415B2 (en) * 2009-01-09 2013-04-23 Corning Incorporated Bend insensitive optical fibers with low refractive index glass rings
WO2018022411A1 (fr) 2016-07-29 2018-02-01 Corning Incorporated Fibre monomodale à faible perte avec coeur dopé au chlore

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479120A2 (fr) 1990-10-05 1992-04-08 Corning Incorporated Procédé de surveillance de la tension d'un fibre
US5410567A (en) 1992-03-05 1995-04-25 Corning Incorporated Optical fiber draw furnace
US6027062A (en) 1997-03-25 2000-02-22 Corning Incorporated Optical fiber dual spindle winder with automatic threading and winding
US7832675B2 (en) 1999-12-28 2010-11-16 Corning Incorporated Method and apparatus for tensile testing and rethreading optical fiber during fiber draw
US7565820B2 (en) 2002-04-30 2009-07-28 Corning Incorporated Methods and apparatus for forming heat treated optical fiber
US8428411B2 (en) * 2010-03-17 2013-04-23 Draka Comteq, B.V. Single-mode optical fiber
US20170168231A1 (en) * 2014-07-10 2017-06-15 Corning Incorporated High chlorine content low attenuation optical fiber
US20180002221A1 (en) * 2015-04-15 2018-01-04 Corning Incorporated Low loss optical fibers with fluorine and chlorine codoped core regions

Also Published As

Publication number Publication date
US20190243063A1 (en) 2019-08-08
US10775558B2 (en) 2020-09-15

Similar Documents

Publication Publication Date Title
US10775558B2 (en) Low loss wide bandwidth optical fiber
US10150695B2 (en) Low loss optical fibers with fluorine and chlorine codoped core regions
US10571628B2 (en) Low loss optical fiber with core codoped with two or more halogens
JP6008575B2 (ja) シングルモード光ファイバ
JP5881213B2 (ja) シングルモード光ファイバ
JP5604028B2 (ja) 単一モード光ファイバ
JP5804793B2 (ja) 単一モード光ファイバおよび光システム
US4852968A (en) Optical fiber comprising a refractive index trench
JP6298893B2 (ja) 損失低下を示す、台形コアを有するシングルモードファイバ
US20060198591A1 (en) Optical fiber, method for manufacturing same and optical transmission channel
US10564349B2 (en) Low bend loss optical fiber with graded index core
EP2656127A1 (fr) Fibre optique monomode à faible perte de macrocourbure
WO2019122943A1 (fr) Fibre monomodale insensible à la perte de courbure, à tranchée peu profonde et système optique correspondant
JP2013242545A (ja) 光ファイバ
US11067744B2 (en) Low bend loss optical fiber with step index core
JP7455079B2 (ja) 光ファイバ
KR20010113819A (ko) 광섬유 제조방법
JP2004126141A (ja) 光ファイバとその製造方法
CN115335742A (zh) 光纤
JP2005196012A (ja) 分散補償ファイバ、複合光ファイバ伝送路

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19706082

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19706082

Country of ref document: EP

Kind code of ref document: A1